JP4804257B2 - Combination sectional view generation method, apparatus and program thereof - Google Patents

Description

  The present invention relates to a method for creating a cross-sectional view of an object using a computer, and more particularly, to a method for creating a cross-sectional view with a plurality of cut surfaces.

  In general mechanical design drawings, the internal shape of an object is often represented by hidden lines. However, when a complicated shape is illustrated, hidden lines increase, making it difficult to see the figure (FIG. 18A). FIG. 18 (a) shows a part in which a cylindrical hollow on a concentric axis is formed in a cylinder extending in the front direction, and many hidden lines are formed to show the shape of the hollow opening portion. Although it is used, it is difficult to grasp the shape of the component by the large number of hidden lines.

  In such a case, a method of temporarily cutting the cut surface so that a portion to be illustrated inside the object can be seen, removing the front portion, and illustrating the remaining portion (FIG. 18B) is taken. The figure drawn in this way is called a sectional view. FIG. 18B is a diagram in which the component of FIG. 18A is cut by a vertical plane passing through the central axis of the component, the cross section is shown by hatching, and the component is not cut by the two-dot chain line The external shape is shown.

  There are several types of display methods for the cross-sectional view, and one of them is a view drawn by combining cross-sectional views with two or more cut surfaces. This is referred to as a “cross-sectional view by combination” (hereinafter referred to as a combined cross-sectional view). This combination cross-sectional view can be further classified into several types, among which “when cutting along two intersecting planes”.

When cutting at two intersecting planes, the object is symmetrical or close to it, and the part you want to show a cross-sectional view on is not on a single plane. This corresponds to the case where the upper cut surface and the lower cut surface can be cut so as to have a certain angle (FIG. 19). The part shown in the front view of FIG. 19 (b) is cut at the cut surface by the cutting line indicated by the line segment OA and the cutting surface by the cutting line indicated by the line segment OB, whereby the cutting model of FIG. 19 (a) is obtained. can get. By projecting this cutting model onto a projection plane parallel to the cutting plane of the cutting line OA or the cutting plane of the cutting line OB, the sectional view of FIG. 19C is obtained.
By combining and showing cross-sectional views cut along two intersecting planes, it is possible to reduce the surface view shown in the drawing and to reduce the drawing space.

That is, the two-dimensional drawing is premised on printing on paper of a fixed size, and a plurality of drawings can be combined and shown in one drawing, so that the paper can be stored on a prescribed size paper.
As a case of cutting at two intersecting planes, cutting is generally performed at two planes, and a well-known CAD (Computer Aided Design) system has already been supported. For example, SolidWorks (registered trademark) and Inventor are compatible.
"JIS Handbook Drafting", Japanese Standards Association, 1995

  By the way, in this cross-sectional view, cross-sectional views cut along two intersecting planes can be further combined and drawn (FIG. 20, JIS (Japanese Industrial Standards) expresses this as a case of a complicated cut surface. In the book, it is called a combined cross-sectional view cut along multiple intersecting surfaces). The part shown in the front view of FIG. 20B is indicated by a cut surface by a cutting line indicated by a line segment OA, a cutting surface by a cutting line indicated by a line segment OB, a cutting surface indicated by a curve BC, and a line segment CD. A cutting model shown in FIG. 20A is obtained by cutting along the cut surface. A sectional view of FIG. 20C is obtained by projecting and combining this cutting model onto a plane parallel to the cutting plane of each line segment. The cross-sectional view of FIG. 20 (c) is obtained by an engineer using an imagination in accordance with a drawing technique.

However, since the conventional system cannot create such a combined cross-sectional view cut at a plurality of intersecting surfaces, the following methods are used by the user using the functions already provided in the conventional system.
・ Combine detailed drawings (Fig. 21)
・ Create multiple cutting models and combine each cross-sectional view (Figure 22)
Each method will be described below with reference to the drawings.

  FIG. 21A is the same as the cutting model of FIG. FIG. 21B is a diagram in which the cutting model is projected on a plane parallel to the cutting plane of the cutting line CD, and FIG. 21C is a diagram in which the cutting model is projected on a plane parallel to the cutting plane of the cutting line OB. FIG. 21D is a diagram in which a cutting model is projected on a plane parallel to the cutting plane of the cutting line AO. The cut lines formed by the cut surfaces in FIGS. 21B to 21D are hatched portions. FIG. 21 (a) can be generated by the user specifying a cutting plane for the part model of FIG. 20 (b), and FIGS. 21 (b) to 21 (d) are parallel to each cut surface. It can be generated by designating a plane (projection designation) by projecting a cut model. In order to obtain the cross-sectional view of FIG. 20 (c), the cut edges of FIGS. 21 (b) to 21 (d) are designated by rectangular areas indicated by dotted lines, and the relative positional relationships of the obtained views are manually set. By designating (designating the projection position), the cross-sectional view of FIG. Compared to FIG. 20 (c), FIG. 21 (e) is simply a combination of the views indicated by the dotted lines in FIG. 21 (c) and FIG. 21 (d). Is displayed. A figure similar to the cross-sectional view of FIG. 20C can be obtained by manually removing unnecessary line segments.

  22 (a) to 22 (c) are cutting models in which unnecessary portions are manually deleted so that the cross-sectional view of FIG. 20 (c) can be obtained for each cutting plane from the cutting model of FIG. 20 (a). . 22D to 22F are diagrams generated by projecting the cutting models of FIGS. 22A to 22C onto the parallel planes of the cutting plane (designation of projection), respectively. is there. The relative positional relationship of the cross-sectional views of FIGS. 22D to 22F is manually specified (projection position specification), and the cross-sectional view of FIG. 22G is obtained. In FIG. 22 (g), unnecessary line segments are displayed as in FIG. 21 (e). Therefore, by performing the same operation to remove unnecessary line segments, the cross-sectional view of FIG. can get.

Regardless of which method is used, the following problems occur. The problem of each method will be explained.
[When creating detailed drawings in combination]
-It is necessary to combine a plurality of detailed drawings, and each time "designation of projection" and "designation of projection position" operations are necessary, and the number of operations of the user for design work is large.

-There is a high degree of freedom in user operations in creating detailed drawings, and incorrect sectional views may be created. If the number of formal operations by the user is only large, the final cross-sectional view will not differ between individuals, but it is necessary to work while assuming the final cross-sectional view. Is easily generated.

When the shape of the model is updated, an operation for readjusting the display range of each detailed drawing is necessary (FIG. 23). When the user performs an operation for expanding the cutting model of FIG. 23 (a) to the cutting model of FIG. 23 (b), the detailed views of FIG. 21 (b) to FIG. 23 (c) to 23 (e) are detailed views. On the other hand, since the rectangular area specified by the user remains as it is, the cut model cuts out beyond the rectangular area of the view, and the positional relationship between detailed drawings must be adjusted by expanding the cut model. In the case of the positional relationship of the detailed drawing as it is, a cross-sectional view having no continuity is obtained as shown in FIG.

As described above, unnecessary straight lines are drawn in the combination part of the cross-sectional views, so that it is necessary to delete this element, which is very troublesome (FIG. 25).
[When creating multiple cutting models and combining each cross-sectional view]

-It is necessary to combine a plurality of sectional views, and each time a "projection designation" or "projection position designation" operation is required, and the number of user operations for design work is large.

Separately from the original cutting model, a cutting model in which unnecessary portions are further cut with the plane of each cutting plane as the front surface is required (three models shown in FIGS. 22A, 22B, and 22C are required). And in creation of a cutting model, a user's operation is highly flexible and an incorrect sectional view may be created.

When the shape of the model is updated, it is necessary to perform operations such as readjustment of the position of each sectional view / deletion of a projection portion of an unnecessary shape / change of a hatching area (FIG. 24). In FIG. 24, although the cutting models of FIGS. 24 (a) to 24 (c) are expanded to the cutting models of FIGS. 24 (d) to 24 (f), FIGS. If the mutual positional relationship of the sectional views of i) is not adjusted, a sectional view having no continuity as shown in FIG. 24J is generated.

As described above, unnecessary straight lines are drawn in the combination part of the cross-sectional views, so that it is necessary to delete this element, which is very troublesome (FIG. 25).
The present invention has been made to solve the above-mentioned problems, and reduces the manual setting by the user's operation at the initial setting, and eliminates the manual resetting at the time of changing the shape of the cutting model. An object of the present invention is to provide a combined sectional view generation device that improves the convenience of the above.

There is one cutting model, which automatically combines multiple projections from which unnecessary parts have been deleted, and provides a function to create a sectional view (complex combined sectional view) with the cutting plane specified by the user in front. .
It also provides a function to automatically recreate (reproject) a two-dimensional drawing following the model shape change.

Projection is performed a plurality of times (the number of cut surfaces) from the direction in which each cut plane is viewed in front, and a combined cross-sectional view cut along a plurality of intersecting planes by combining the respective projection views is created (FIG. 1).

When projecting each cross-sectional view, parts unnecessary for combining are removed during projection (FIG. 2). This solves the problem (FIG. 25) that occurs when an unnecessary portion is actually cut and projected in the three-dimensional model.

In the case of a complicated combination sectional view, there is a special cutting method as shown in FIG. 20, but in FIG. 20, the portion cut in a cylindrical shape is excluded from the sectional view to be combined. A cross-sectional view can be drawn.

-Since the information of the sectional view to be automatically combined is created from the information held by the three-dimensional model, the drawing can be automatically recreated following the model shape change.

The combined sectional view generation program according to the present invention receives a plurality of cutting line inputs from a user for a three-dimensional model in a computer and acquires the cutting lines as target cutting lines for each of the plurality of cutting lines. searches the connection section line to be connected to the target section line, the target section line and retrieved intersection the determined Me and the connecting section line, the cut surface of the three dimensional model which is cleaved by the target section line determined as the target cutting plane, obtains a cut surface of the three dimensional model which is cut by a cutting line to be the intersection and street the target section line perpendicular as an adjacent cutting surface, the destination select cross-section the normal vector and a reverse obtains a vector as line-of-sight direction vector, the elements of the three-dimensional model to identify the first element located in a normal vector side of the target section surface than the target cutting plane, wherein Among the elements of the dimensional model, the neighbor from the cutting surface to identify the second element positioned normal vector side of the adjacent section plane, the first element from the 3-dimensional model and said second element Is obtained as a projection target model, a projection obtained by projecting the projection target model from the line-of-sight direction vector is obtained as a cross-sectional view at the target cutting line, and each of the plurality of cutting lines is subjected to the target A cross-sectional view obtained for each cutting line is combined to generate a combined cross-sectional view, and a process of outputting the combined cross-sectional view is executed .

As described above, in the present invention, a plurality of cutting lines are input from the user to the three-dimensional model.
For each of the plurality of cutting lines, the cutting line is acquired as a target cutting line, a connection cutting line connected to the target cutting line is searched, and the connection cutting line searched for the target cutting line and Of the three-dimensional model cut by the target cutting line, the cutting plane of the three-dimensional model cut by the target cutting line as a target cutting plane, and cut by a cutting line passing through the intersection and perpendicular to the target cutting line. A cutting plane is obtained as an adjacent cutting plane, a vector opposite to the normal vector of the target cutting plane is obtained as a line-of-sight vector, and the method of the target cutting plane is more than the target cutting plane among the elements of the three-dimensional model. A first element located on the line vector side is identified, and a second element located on the normal vector side of the adjacent cut surface from the adjacent cut surface is specified among the elements of the three-dimensional model, and the previous A three-dimensional model obtained by removing the first element and the second element from the three-dimensional model is obtained as a projection target model, and a projection view obtained by projecting the projection target model from the line-of-sight direction vector is a cross section at the target cutting line. As a figure, for each of the plurality of cutting lines, a combined sectional view is generated by combining the sectional views obtained for each target cutting line, and the combined sectional view is output. In addition, even when the shape of the three-dimensional model is changed, a combined sectional view is automatically generated and the convenience of the user is greatly improved. In addition, the fact that the number of designations by the user is small also means that the same combination sectional view can be obtained by any user. That is, operational mistakes can be suppressed.

  “Identifying the element and / or part of the element that can be viewed with the line-of-sight direction of the target cutting line as the line-of-sight direction” excludes elements that are not visible in the cross-sectional view in the projected element and / or part of the element. Is a process for Identifying a visible element and / or part of an element also identifies an invisible element and / or part of an element. For example, an invisible element and / or part of an element is identified by deleting an invisible element and / or part of the element.

  According to the “step of identifying an element and / or part of an element that can be viewed with the line-of-sight direction of the target cutting line as the line-of-sight direction in the identified three-dimensional model” Information) can also be specified, and invisible information can be configured to be visible. Therefore, it belongs to this invention at the time of grasping | ascertaining at least visible or invisible.

The combination cross-sectional view generation program according to the present invention does not include elements on the surface of the adjacent cut surface when the projection target model is obtained as necessary.

As described above, in the present invention, when the projection target model is obtained, elements on the surface of the adjacent cut surface are not included. Therefore, when an element and / or a part of the element including the adjacent surface are specified. In some cases, an unnecessary element may be displayed at the boundary portion of the cross-sectional view of the cutting line, and it is possible to avoid displaying this unnecessary element .

Combined sectional view producing program according to the present invention, if necessary, a plurality of cutting lines which has accepted the input from the user, look including the step of the cutting lines is equal to or straight, the cutting line If is not a straight line, the process related to the cutting line is not executed.

As described above, the present invention includes a step of determining whether or not the cutting line is a straight line for a plurality of cutting lines that have received input from the user. Since the process concerning a line is not performed , the cutting line which should be processed can be limited to a straight line, and it has the effect that an unnecessary process can be avoided. For example, the cut surface of the cylindrical surface indicated by the arc cutting line is not subject to processing. This processing is desirable from the viewpoint of not performing unnecessary processing immediately after being taken out as a processing target from a plurality of cutting lines. The processing related to the cutting line of the arc is executed to obtain the sectional view to be combined for the first time, and the sectional view to be combined necessary for the combined sectional view is specified from all the sectional views to be combined, A combined sectional view can also be generated by combining the identified sectional views. However, when the cross-sectional view that is not specified and is to be combined is not used, the processing for obtaining the cross-sectional view is wasted.

When the combined sectional view generation program according to the present invention generates the combined sectional view as necessary, the combined sectional view is combined with the sectional views based on the intersecting axes of the cutting planes specified by the plurality of cutting lines . Is generated.

Thus, in the present invention, when generating a combined sectional view, since to generate combined sectional view by combining the sectional views on the basis of the cross-axis of the cut surface which is specified by the plurality of cutting lines, different The sectional view of each cutting line obtained by projecting on the projection plane can be aligned and projected onto the same plane. When overlapping occurs as a result of projection, it is desirable to translate on the same plane so that overlapping does not occur. Note that the method for detecting whether or not the elements on the two-dimensional plane are overlapped is a well-known and commonly used technique and will not be described in detail.

The combined sectional view generation program according to the present invention receives a first vector indicating a line-of-sight direction and a second vector indicating a line-of-sight upward direction from a user as necessary, and obtains an angle between the sight line direction vector a vector, obtains a third vector indicating the viewing up-direction of the target section line from said angle determined with the second vector, for the projection target model, the third Is obtained as a cross-sectional view at the target cutting line by projecting a plane having the above vector as the projection direction and a plane having the gaze direction vector as the viewing direction .

  Thus, in the present invention, not only the line-of-sight direction of the target cutting line, but also the line-of-sight direction of the target cutting line is obtained from the line-of-sight direction of the cross-sectional view received from the user and the line-of-sight direction of the cross-sectional view Since the projection is performed on the projection surface in accordance with the line-of-sight direction and the line-of-sight direction, there is an effect that a cross-sectional view that is a combination target whose directions are determined can be obtained.

Combined sectional view producing program according to the present invention, if necessary, elements of the generated the combined sectional view is, the color is different for each cross section to unions.
As described above, in the present invention, since the color of the elements in the combination cross-sectional view is different for each cross-sectional view to be combined, the user can determine the elements of the cross-sectional view to be combined. . Compared with the case where the boundary line of the cross-sectional view to be combined is displayed so as to be discriminated by a dotted line or the like, it has high visibility.
In the embodiment described later, hatched hatching is given to the surface cut by the cut surface.

Combined sectional view producing program according to the present invention, if necessary, a different color for each cross section to the union is different depending on associated with the corresponding cutting line color.
Thus, in the present invention, not only the color is different for each element of each cross section to be combined target, because more colors different cutting lines of interest, cut element group for each cross section to be combined target This has the effect that the correspondence with the line can be visually recognized.
For example, the color of the sectional view element to be combined is the same as the color of the cutting line .

The color associated with the cutting line may be received by the user or may be automatically given by the apparatus itself.
When the three-dimensional model (cutting model) for each cutting line immediately before projection is displayed three-dimensionally, the color of the cutting model can be made different for each cutting line.

Each step is executed by a computer having at least a memory and a processor. The operation subject is a processor or a computer.

Elements, the surface constituting the 3D model, a line, a point or the like. A part of the element is a part of the element, which corresponds to a part of the surface and a part of the line.

The combined sectional view generation device can be implemented as a function of a CAD device in addition to a single configuration that receives three-dimensional CAD data from a CAD device and sends the combined drawing data to the CAD device.
Further, the present invention can be grasped not only as a method but also as a combined sectional view generation device and a combined sectional view generation program, that is, an apparatus and a program.
These outlines of the invention do not enumerate the features essential to the present invention, and a sub-combination of these features can also be an invention.

By implementing this function, it is possible to provide a function of creating a complicated combination sectional view that is not realized in the conventional system. This has the following effects.
-It is not necessary to create a plurality of cross-sectional views required in the conventional system, manually correct each cross-sectional view, and create a complicated combined cross-sectional view by combining the cross-sectional views.

・ In the conventional system, the combined cross-section created by the user cannot follow the model shape editing, so if the model shape is changed or the cut plane (plane) is changed, From the beginning, it was necessary to create a combined sectional view using the same procedure. On the other hand, according to the present invention, cross-sectional views can be automatically re-created following model shape editing, and the number of man-hours for re-creating drawings can be greatly reduced.

  From the above, using this function makes it possible to significantly reduce the number of operations for creating and re-creating combined cross-sectional views, and to significantly reduce the man-hours required to create combined cross-sectional views. .

  Embodiments of the present invention will be described in detail with reference to the drawings. The present invention can be implemented in many different forms. Therefore, it should not be interpreted only by the description of this embodiment. Also, the same reference numerals are given to the same elements throughout the present embodiment.

  In the present embodiment, the apparatus will be mainly described. However, as will be apparent to those skilled in the art, the present invention can also be implemented as a program usable on a computer. Therefore, the present invention can take an embodiment as hardware, an embodiment as software, or an embodiment of a combination of software and hardware. The program can be recorded on any computer-readable medium such as a hard disk, CD-ROM, optical storage device, or magnetic storage device.

(First embodiment of the present invention)
A combined sectional view generation device according to a first embodiment of the present invention will be described with reference to the drawings.
[1. Device configuration diagram]
FIG. 3 is a block diagram of the combined sectional view generating apparatus according to the present embodiment.
The combined sectional view generation apparatus according to the present embodiment includes an input unit 200 for capturing data, an output unit 300 for sending data, a cutting line acquisition unit 10, a boundary plane generation unit 20, a line-of-sight direction generation unit 30, and an unnecessary projection shape removal unit 40. , Visible information generating means 50, coordinate converting means 60, and sectional view combining means 70.
The cutting line acquisition unit 10 has a function of acquiring a cutting line from a cutting line list specified by the user.

  The boundary plane generation unit 20 has a function of obtaining a boundary plane from a cutting line and a connection cutting line that is a cutting line connected to the cutting line. Of these boundary planes, a boundary plane obtained without using a connection cutting line is a cutting plane. The cutting plane is identified from the cutting line and the normal vector of the cutting plane. The boundary plane other than the cutting plane is obtained from the intersection of the cutting line and the adjacent cutting line, the plane on which the cutting line is drawn, and the cutting plane.

  The line-of-sight direction generating means 30 has a function of setting the line-of-sight direction to a vector in the direction opposite to the normal vector of the cut surface. A rotation matrix is obtained from the user-specified line-of-sight direction and the generated line-of-sight direction, and the generated line-of-sight upward direction is obtained from the user-specified line-of-sight upward direction and the obtained rotation matrix.

  The unnecessary projection shape removing means 40 removes an unnecessary projection shape by the cut surface and the adjacent cut surface. For the cut surface, the shape on the surface is left as it is, and for the adjacent cut surface, the shape on the surface is also removed. As a result, when a combined sectional view is created, unnecessary straight lines are prevented from being generated.

The visible information generating means 50 has a function of generating information about an element or a part of the element that is visible when viewed from the viewing direction.
The coordinate conversion means 60 has a function of performing coordinate conversion from 3D information to 2D information on an element including a part of an element whose shape has been removed with respect to a surface specified from the generated visual line direction and the upward direction of the generated visual line. .
The cross-sectional view combination means 70 has a function of obtaining a combined cross-sectional view by combining the cross-sectional views to be combined from the crossing axes of the cut planes.

The input means 200 may be three-dimensional CAD data (three-dimensional CAD data of a cutting model obtained by cutting a range specified by a cutting line by a cutting plane, or three-dimensional CAD data of a three-dimensional model before cutting. It is also possible to have a function of capturing the cutting line, the line-of-sight direction, and the line-of-sight direction specified by the user. The designation of the cutting line by the user designates a line segment with respect to the surface view (front view etc.) of the object. In addition, a cut surface can be designated when the object is displayed three-dimensionally. Since all the cutting planes are perpendicular to the drawing plane, it is possible to adopt a configuration in which the user specifies the cutting plane under this condition. Specifying the line-of-sight direction and the line-of-sight direction is a vector input, and specifies a certain cutting line and specifies what section (right side view, bottom view, etc.) the sectional view related to the cutting line corresponds to. Can also be done. Of course, it is also possible to specify with arrows in the two-dimensional space and the three-dimensional space.
The output unit 300 has a function of sending out the combined sectional view obtained by the sectional view combining unit 70.

[2. Hardware configuration diagram]
The computer in which the combined sectional view generation device is constructed includes a CPU (Central Processing Unit), a main memory such as a DRAM (Dynamic Random Access Memory), an HD (hard disk) as an external storage device, a keyboard and a mouse as input devices, It consists of a display as an output device, a LAN card as an expansion card for connecting to a network, and the like.

  In other words, the combination sectional view generation program recorded on the external storage medium such as a CD-ROM is copied to the HD of the computer so that the combination sectional view generation program can be read and executed. A sectional view generation apparatus is constructed on the computer.

[3. Operation]
The main operating body is any one of the means or the main, but from the viewpoint of hardware, it is a CPU. Moreover, the functional configuration by each means is merely an example, and various functional configurations can be adopted as will be apparent to those skilled in the art.

The input unit 200 acquires information on the cutting line defining the cross-sectional position from the three-dimensional model for creating the cross-sectional view (S11, FIG. 13). For example, as shown in FIG. 4, information on the cutting line 1, the cutting line 2, the cutting line 3, the cutting line 4, and the plane on which these cutting lines are drawn is acquired. The input means 200 also takes in the three-dimensional CAD data itself. The drawing object which is the part of FIG. 4 is a substantially rectangular shape having a predetermined thickness, and circular holes are formed at a plurality of coaxial rotation positions.
First, information for projecting each sectional view (projection direction, plane for deleting unnecessary portions) is obtained. Specifically, it is as follows.

The next steps S21 to S43 are looped by the number of cutting lines (S20, S21). By repeating these processes, the sectional view information of the number of straight cutting lines can be acquired.
The cutting line acquisition means 10 acquires a cutting line from the cutting line list (S31). For example, the cutting line CLN1 is acquired.
The boundary plane generation means 20 determines whether or not the acquired cutting line is a straight line (S32). If it is not a straight line, the process returns to S20.

  If it is a straight line, the boundary plane generation means 20 searches for a cutting line connected to the target cutting line (S33, FIG. 5). For example, if the cutting line CLN1 is the target cutting line, the cutting lines CLN2 and CLN3 are searched. Specifically, it is determined whether or not the cutting line in the cutting line list and the target cutting line are connected.

  The boundary plane generation means 20 obtains the intersection of the target cutting line and the connection cutting line (S34). For example, the intersections of the target cutting line CLN1 and the connection cutting line CLN2, and the intersections of the target cutting line CLN1 and the connection cutting line CLN3 are obtained as CP1 and CP2, respectively (FIG. 5).

  The boundary plane generating means 20 obtains a plane that passes through the target cutting line and whose normal vector matches the normal vector of the cutting plane related to the target cutting line of the three-dimensional model (S35). For example, a plane BPL0 that passes through the target cutting line CLN1 and whose normal vector matches the normal vector of the cutting plane of the three-dimensional model is calculated (FIG. 6).

  The boundary plane generation means 20 obtains a plane perpendicular to the plane on which the target cutting line is drawn and the cutting plane related to the target cutting line and passing through the intersection of the cutting lines (S36). For example, the plane on which the cutting line is drawn and the plane perpendicular to BPL0 and passing through CP1 / CP2 are calculated (BPL1 / BPL2) (FIG. 6). Note that the normal vector of BPL1 is the direction from CP2 to CP1, and the normal vector of BPL2 is the direction from CP1 to CP2.

  The line-of-sight direction generation means 30 obtains the line-of-sight direction of the cut surface related to the target cut line as the reverse direction of the normal vector of the cut surface (S41, FIG. 14). For example, the line-of-sight direction in the opposite direction is obtained from the normal vector NV0 of the cut plane BPL0 (FIG. 6). The line-of-sight direction vector is VW.

  A rotation matrix is obtained for superimposing the line-of-sight direction vector of the cutting plane related to the target cutting line obtained by the line-of-sight direction generating unit 30 on the line-of-sight direction vector of the sectional view (S42). For example, a rotation matrix M for superimposing the line-of-sight direction vector VW of the cut surface on the line-of-sight direction vector of the cross-sectional view is calculated (FIG. 7).

  The line-of-sight direction generating means 30 multiplies the rotation vector obtained by the line-of-sight direction vector in the sectional view to obtain the line-of-sight direction vector of the cut surface related to the target cutting line (S43). For example, a vector UVW obtained by multiplying the vector in the sight line direction of the sectional view by the rotation matrix M is obtained (FIG. 7).

  The line-of-sight direction vector of the cut plane, the line-of-sight upward vector of the cut plane, the cut plane, and the adjacent cut plane are held as cross-sectional view information. For example, the sight line direction vector VW of the cut surface, the sight line upward direction vector UVW of the cut surface, the cut surface BPL0, the adjacent cut surface BPL1, and the adjacent cut surface BPL2 are held in one lump (sectional view information).

By executing the cutting line segments S21 to S43 so far, for example, the sectional view information is obtained for the cutting lines 1 to 4. However, since the cutting line 3 is not a straight line, this information does not exist.
Next, the processing of S52 to S74 is repeated for several orders of the sectional view information by the loop of S50 and S51. Each sectional view can be obtained by these processes.
The unnecessary projection shape removing unit 40 acquires the cross-sectional view information from the cross-sectional view information list (S52).

The unnecessary projection shape removing means 40 acquires the cut surface (S53). For example, BPL0 is acquired for the cutting line OB.
Unnecessary projection shape removing means 40 removes the projection shape on the normal vector side of the cut surface (S54, FIG. 8). The shape on the cut surface is not removed. For example, the projected shape on the normal vector side of BPL0 is removed, and the shape on BPL0 is not removed.

  The visible information generating unit 50 projects the section plane information acquired by the cut surface line-of-sight direction vector and the cut surface line-of-sight upward vector (S55). For example, the projection is performed using the gaze direction vector VW of the cut surface and the gaze upward direction vector UVW of the cut surface. Specifically, the visible information of the elements (planes, lines, points) of the three-dimensional model when viewed from these gaze directions and the gaze direction is obtained (visible information can be obtained only in the gaze direction). Therefore, visible information that is information for projection is acquired. In other words, the visible information that is information for projection is specified. Invisible information can also be acquired and used as a hidden line. An element is invisible because it is hidden by other elements. The entire element may be invisible, but some elements may be invisible. Visible information is acquired after removing a part of the three-dimensional model in S53 and S54 because the cut is hidden when viewed from the gaze direction and the gaze direction by a part of the three-dimensional model. It is to do. Therefore, if this correspondence is not performed, the processing of S53 and S54 can be configured to be performed between S71 and S74.

The processing of the next S71 to S74 is repeated by the number of projection shapes of the three-dimensional model by S60 (FIG. 15) and S61. That is, the process is repeated for the number of elements constituting the visible information obtained in S53. When including invisible information, the number of elements is added.
The unnecessary projection shape removing means 40 acquires the cut surface and the adjacent cut surface from the sectional view information (S71). Note that S71 may be acquired only once before S60 outside the loop.

  The unnecessary projection shape removing means 40 removes the projection shape on the normal vector side of the adjacent cut surface from the three-dimensional projection shape (S72, S73). The projected shape and the adjacent cut surfaces BPL1 and BPL2 are compared, and shapes other than the shapes existing on the normal vector side and the plane of the adjacent cut surfaces BPL1 and BPL2 are projected (FIGS. 9 and 10). That is, the shape existing on the normal vector side and the adjacent cut surface is removed. An element or a part of an element that is removed but not a drawing target may be used. In addition, the element which cross | intersects a cut surface is divided | segmented by a cut surface. Further, the processing of S71 to S73 can be performed between S50 and S55. However, depending on the mounting environment, the process of removing the shape existing on the adjacent cut surface cannot be processed between S50 and S55, and still needs to be processed in S72 and S73.

  Data to be projected onto a two-dimensional drawing is created from the projection shape of the three-dimensional model divided by the coordinate conversion means 60 (S74, FIG. 11). That is, the coordinate conversion is performed from the three-dimensional data to the two-dimensional data based on the line-of-sight direction and the line-of-sight direction.

  Data to be projected onto the two-dimensional drawing created by the cross-sectional view combination means 70 is projected onto one surface view (S81). In other words, by combining the cross-sectional views 1 to 4 (no cross-sectional view 3) projected in the cross-sectional view information list based on the coordinate-converted two-dimensional data, a combined cross-sectional view cut along a plurality of intersecting surfaces is created (FIG. 12). Actually, when the cross axis for obtaining the cross-sectional view passes through the model origin, the cross-sectional axis is rotated as the central axis to obtain the combined cross-sectional view.

  The output means 300 sends out the created sectional view. As output destinations, there are a CAD device, each means which is a functional element of the CAD device, a display, a printing device, and the like. Note that the functions of the input unit 200 and the output unit 300 vary depending on the implementation of the combined sectional view generation apparatus itself. The combined sectional view generation device can be mounted as, for example, a single component, a component of a CAD system, or the like.

(Other embodiments)
[When cutting along the center plane along the curve]
The specific example of the cross-sectional view described in the first embodiment is a case of a complicated cut surface in the cross-sectional view of the combination, but the first embodiment is performed even when the cross-sectional view is cut along the center plane along the curve. Forms can be applied.
When the user specifies the line-of-sight direction and the line-of-sight direction by cutting the tube having the bend of FIG. 16A at the center plane, first, when the operation of the first embodiment is executed, Each sectional view of FIG. 16B is obtained. Further, by combining these sectional views, the combined sectional view of FIG. 16C is obtained. In FIG. 16C, due to the crossing axis of the cross-sectional views, when the cross-sectional views are combined, there may be a portion where the cross-sectional views overlap each other. In this case, the overlapping portion is eliminated by translating one of the cross-sectional views that overlap only the overlapping portion. When a new overlapping portion is generated by the parallel movement, the combined cross-sectional view without the overlapping portion can be finally obtained by continuously performing the parallel movement. This translation can be performed by the user himself / herself, but may be automatically executed by the apparatus by recognizing the end of the sectional view.

[Color scheme for each section]
In the first embodiment, a color can be assigned to each cross-sectional view to display a combined cross-sectional view, and the configuration of each cross-sectional view constituting the combined cross-sectional view can be easily understood. In FIG. 17, only the cutting line OB is colored for convenience of explanation and convenience of illustration. In addition, although red is provided, since it cannot be visually recognized from the restriction | limiting of the figure on an application system, it has shown with the leader line and its description. First, in the front view in which the user sets the cutting line, the cutting line set by the user is colored and displayed (FIG. 17A). As a result of the processing being executed by the apparatus, FIG. 17D is obtained through FIGS. 17B and 17C. Normally, FIGS. 17A and 17D touch the user's eyes on the display. Although the cutting line OB has been described here, the cutting line OA, the cutting line BC, and the cutting line CD are also colored, and the cross-sectional views corresponding to the cutting lines are colored in the same color.

In addition, although FIG.17 (b) and FIG.17 (c) did not display on a display, you may display in order to make a user's figure grasp easy. In this case, it is colored with the color relating to the corresponding cutting line of the cut surface.
In addition, the system may automatically color the same color on the corresponding cut line, cut surface, and cross-sectional view, and when the user designates a color, it is desirable to use that color. The designation of the user's color may be one of a cutting line, a cut surface, and a cross-sectional view.

  Although the present invention has been described with the above embodiments, the technical scope of the present invention is not limited to the scope described in the embodiments, and various modifications or improvements can be added to these embodiments. . And embodiment which added such a change or improvement is also contained in the technical scope of the present invention. This is apparent from the claims and the means for solving the problems.

It is combination explanatory drawing of sectional drawing which makes each cut surface of this invention the front. It is removal explanatory drawing of the unnecessary part by sectional drawing combination of this invention. It is an example of the block block diagram of the combination sectional drawing production | generation apparatus which concerns on the 1st Embodiment of this invention. It is an example of the cutting line which defined the cross-sectional position which concerns on the 1st Embodiment of this invention. It is an example of the position of the cutting line and cutting point which concern on the 1st Embodiment of this invention. It is an example of the boundary plane which concerns on the 1st Embodiment of this invention. It is explanatory drawing how to obtain | require the visual axis direction vector of the combination sectional drawing concerning the 1st Embodiment of this invention. It is an example (the shape on a plane is not removed) of the removal of the unnecessary part by the cut surface which concerns on the 1st Embodiment of this invention. It is an example of the removal of the unnecessary part by the adjacent cut surface which concerns on the 1st Embodiment of this invention. It is an example of the removal of the unnecessary part by the adjacent cut surface which concerns on the 1st Embodiment of this invention. It is the example which removed the unnecessary part and projected on the cut surface which concerns on the 1st Embodiment of this invention, and an adjacent cut surface. It is an example which combined each sectional view concerning a 1st embodiment of the present invention. It is the process flow 1 which concerns on the 1st Embodiment of this invention. It is the processing flow 2 which concerns on the 1st Embodiment of this invention. It is the processing flow 3 which concerns on the 1st Embodiment of this invention. It is generation | occurrence | production explanatory drawing of the combination sectional drawing in the case of cut | disconnecting in the center plane along the bending which concerns on other embodiment of this invention. It is explanatory drawing of the color scheme to each sectional drawing which concerns on other embodiment of this invention. It is explanatory drawing of the drawing method of the target object by a hidden line, and the drawing method of the target object by a cross section (cut). It is an example of a sectional view cut along two intersecting planes. It is an example of sectional drawing cut | disconnected by the cut surface of 3 planes. It is an example of sectional drawing by combining a plurality of detailed drawings. It is sectional drawing by combining the figure projected from the some cutting direction. It is explanatory drawing (when a model is expanded) explanatory drawing of the display range of sectional drawing of the combination of multiple detailed drawings. It is explanatory drawing (when a model is expanded) explanatory drawing problem of the combination of the projection figure from two or more cutting directions. It is an example of an unnecessary element drawn when combining a plurality of sectional views.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cutting line acquisition means 20 Boundary plane production | generation means 30 Gaze direction production | generation means 40 Unnecessary projection shape removal means 50 Visible information generation means 60 Coordinate conversion means 70 Cross-sectional view combination means 200 Input means 300 Output means

Claims (9)

On the computer,
Accepting an input of a plurality of cutting lines from the user with respect to the three-dimensional model,
For each of the plurality of cutting lines, obtain the cutting line as a target cutting line,
Find the disconnection line connected to the target section line,
Calculated Me an intersection point between the connecting section line retrieved and the target section line,
Obtain the cut surface of the three-dimensional model cut by the target cutting line as the target cutting surface,
The cut surface of the three dimensional model which is cut by a cutting line to be as the target section line perpendicular to the intersection determined as an adjacent cutting surface,
Obtains a normal vector and a reverse vector of the target switching section as line-of-sight direction vector,
Among the elements of the three-dimensional model to identify the first element located in a normal vector side of the target section surface than the target cutting plane,
Among the elements of the three-dimensional model, to identify a second element located in the normal vector side of the adjacent cutting surface than the adjacent section plane,
A three-dimensional model obtained by removing the first element and the second element from the three-dimensional model is obtained as a projection target model;
A projection obtained by projecting the projection target model from the line-of-sight direction vector is obtained as a cross-sectional view at the target cutting line,
For each of the plurality of cutting lines, a combined sectional view is generated by combining the sectional views obtained for each target cutting line ,
Output the combined sectional view
A combined sectional view generation program for executing a process . 2. The combined sectional view generation program according to claim 1 , wherein when the projection target model is obtained , elements on the surface of the adjacent cut surface are not included . A plurality of cutting lines which has accepted the input from the user, look including the step of said cutting line to determine whether a straight line,
The combined sectional view generation program according to claim 1 or 2, wherein when the cutting line is not a straight line, the process related to the cutting line is not executed. When generating the combined sectional view, the combined sectional view is generated by combining the sectional views on the basis of the intersecting axis of the cutting plane specified by the plurality of cutting lines .
The combined sectional view generation program according to any one of claims 1 to 3, wherein the program is executed . In the computer,
Receiving a first vector indicating the line-of-sight direction of the cross-sectional view and a second vector indicating the line-of-sight direction from the user ;
Obtaining an angle formed by the first vector and the line-of-sight direction vector ;
From the second vector and the obtained angle , a third vector indicating the upward direction of the target cutting line is obtained,
As for the projection target model, a projection view obtained by projecting a plane with the third vector as the line-of-sight direction and the line-of-sight direction vector as the line of sight is obtained as a cross-sectional view at the target cutting line.
The combined sectional view generation program according to any one of claims 1 to 4, wherein the program is executed . Elements of the generated the combined sectional view is the claims 1 to combined sectional view producing program according to any one of 5 colors for each cross section to union different. The different color for each cross section to unions, combined sectional view producing program according to claim 6 vary depending on associated with the corresponding cutting line color. Means for receiving input of a plurality of cutting lines from a user for the three-dimensional model ;
For each of the plurality of cutting lines, means for acquiring the cutting line as a target cutting line;
Means for retrieving a connection section line to be connected to the target section line,
And determined Mel means an intersection point between the connecting section line retrieved and the target section line,
Means for obtaining a cut surface of the three-dimensional model cut by the target cutting line as a target cutting surface;
Means for determining a cut surface of the three-dimensional model that is cut by a cut line that passes through the intersection and is perpendicular to the target cut line as an adjacent cut surface;
It means for determining a normal vector and a reverse vector of the object cutting plane as line-of-sight direction vector,
Among the elements of the three-dimensional model, comprising: means for identifying a first element located in a normal vector side of the target section surface than the target cutting plane,
Among the elements of the three-dimensional model, comprising: means for identifying a second element located in the normal vector side of the adjacent cutting surface than the adjacent section plane,
Means for obtaining, as a projection target model, a three-dimensional model obtained by removing the first element and the second element from the three-dimensional model;
Means for obtaining a projection view obtained by projecting the projection target model from the line-of-sight direction vector as a cross-sectional view at the target cutting line;
For each of the plurality of cutting lines, means for generating a combined sectional view by combining sectional views obtained for each target cutting line ;
Means for outputting the combined sectional view ;
An apparatus for generating a combined sectional view, comprising: Computer
Accepting an input of a plurality of cutting lines from the user with respect to the three-dimensional model,
For each of the plurality of cutting lines, obtain the cutting line as a target cutting line,
Find the disconnection line connected to the target section line,
Calculated Me an intersection point between the connecting section line retrieved and the target section line,
Obtain the cut surface of the three-dimensional model cut by the target cutting line as the target cutting surface,
The cut surface of the three dimensional model which is cut by a cutting line to be as the target section line perpendicular to the intersection determined as an adjacent cutting surface,
Obtains a normal vector and a reverse vector of the object cutting plane as line-of-sight direction vector,
Among the elements of the three-dimensional model to identify the first element located in a normal vector side of the target section surface than the target cutting plane,
Among the elements of the three-dimensional model, to identify a second element located in the normal vector side of the adjacent cutting surface than the adjacent section plane,
A three-dimensional model obtained by removing the first element and the second element from the three-dimensional model is obtained as a projection target model;
A projection obtained by projecting the projection target model from the line-of-sight direction vector is obtained as a cross-sectional view at the target cutting line,
For each of the plurality of cutting lines, a combined sectional view is generated by combining the sectional views obtained for each target cutting line ,
Output the combined sectional view
A combined sectional view generation method characterized by executing processing .

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